It's nice when people care about something. Even when those people are actors.

So you might enjoy this strongly worded PSA from the NRDC Action Fund that features, among others, Leonardo DiCaprio and Edward Norton, as well as Justin Long, Mac from the "Get a Mac" campaign.

The Natural Resources Defense Council is desperate for everyone to e-mail their senators repeatedly in order to elicit their support for the Clean Energy Jobs and American Power Act.

The idea behind this bill is to change America's dependence on oil that it buys from, as the NRDC puts it, "countries that don't share our values."

America can, the council believes, "lead in the development of clean energy technology and manufacturing."

At one point in the PSA, Long drops his pants (which are out of shot, boys and girls) because global warming is making things a little too hot for his legs. Then he joins in the plea for everyone to e-mail their senators in order to get them to vote for the bill.

Interestingly, Long wryly reminds you of his most commercial claim to fame, by suggesting you should e-mail "whether it's on a Mac," before pausing very slightly to add, "or any other kind of computer." Some might find this veers very slightly toward the uncomfortable side of blissful commercialism.

Apple itself has been criticized for perhaps not being quite as green as makers of electronic things ought to be, a claim that CEO Steve Jobs refutes. He does admit, on Apple's own site, that when it comes to the environment, "we have failed to communicate the things that we are doing well."

He also declares: "By 2010, Apple may be recycling significantly more than either Dell or HP as a percentage of past sales weight."

However, it will be interesting to see whether actions such as that of the NRDC, with so many famous marketable faces might lead, one day, to iPads that are made without any dependence on foreign oil and with a biodegradable camera.